\begin{tikzpicture}
    \begin{scope}
        \tkzDefPoints{0/0/B,  4/0/C,  3/2/A}
        \tkzDrawPolygon(A,B,C)
        \tkzLabelPoints[above](A)
        \tkzLabelPoints[left](B)
        \tkzLabelPoints[right](C)
    \end{scope}

    \begin{scope}[xshift=6cm]
        \tkzDefPoints{0/0/B,  4/0/C,  3/-2/A, 3/2/A'}
        \tkzDrawPolygons(A,B,C  A',B,C)
        \tkzDrawSegment[dashed](A',A)
        \extkzLabelAngel[0.5](B,A',A){$1$}
        \extkzLabelAngel[0.6](A,A',C){$3$}
        \extkzLabelAngel[0.5](A',A,B){$2$}
        \extkzLabelAngel[0.6](C,A,A'){$4$}
        \tkzLabelPoints[above](A')
        \tkzLabelPoint[above left](B){$B'$}
        \tkzLabelPoint[below left](B){$(B)$}
        \tkzLabelPoint[above right](C){$C'$}
        \tkzLabelPoint[below right](C){$(C)$}
        \tkzLabelPoints[below](A)
    \end{scope}
\end{tikzpicture}

